"Household size" is defined as the number of people living in a household. In a sample of 1200 households in California in 2010, the average household size was 2.9 people. Which of the following conclusions can be drawn from this information? Select all that are correct.

a) There must have been an error in the calculation, because no household can have 2.9 people.
b) The typical household in the sample consisted of 2.9 people.
c) There were 3480 people living in the sampled households.
d) In the sample, 600 households had fewer than 2.9 people.